Original post by: Dan A+ ,
If your iPhone keeps giving errors and now won’t get past the start screen, you may have to use iTunes to reinstall the iPhone’s operating system. You can do this without losing your data: # Download and install iTunes on a laptop or desktop computer. # Connect your iPhone to your computer via USB, and start iTunes. # Press and hold the Home button and Side button on your iPhone. This will take you to a screen that will give you prompts to follow. # Click '''Update'''. The latest version of iOS that works on your device should install and still keep your data.